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Using micro-sized cut metal wires, Japanese team forges path to new uses for terahertz waves


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IMAGE: Researchers from Tokyo University of Agriculture and Technology successfully tested reflectionless, highly refractive index metasurfaces that may eventually be used in practical applications to send, receive, and manipulate light and.
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Credit: Takehito Suzuki, Tokyo University of Agriculture and Technology
Japanese researchers successfully tested reflectionless, highly refractive index metasurface that may eventually be used in practical applications to send, receive, and manipulate light and radio waves in the terahertz waveband (THz). THz is measured in millionths of a meter, known as micrometers. The metasurface, an artificial two-dimensional flat material, was made of micro-sized cut metal wires of silver paste ink placed on both the front and back of a polyimide film. The team, led by Takehito Suzuki, Associate Professor at the Tokyo University of Agriculture and Technology (TUAT) Institute of Engineering, published their fin ....

Yuko Shimabayashi , Takehito Suzuki , Harumi Asada , Kota Endo , Precursory Research For Embryonic Science , Division Of Advanced Electrical , Technology Agency , Internet Foundation , Technology Foundation , Memorial Foundation , Tokyo University Of Agriculture , Department Of Strategic Basic Research , Technology Inc , Electronics Engineering , School Of Engineering , Inamori Foundation , Institute Of Engineering , Noguchi Institute , Kato Foundation For Promotion Of Science , Department Of Electrical , Associate Professor , Tokyo University , Electronic Engineering , Graduate School , Advanced Electrical , Japan Science ,

Performance of methane conversion solid catalyst is predicted by theoretical calculation


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IMAGE: Mole fraction along the reaction time (s) calculated by the reactor simulation. The inlet gas consisted of CH4, O2, and He (as inert gas). The total pressure was set to.
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Credit: Atsushi Ishikawa
Japanese researchers have developed a simulation method to theoretically estimate the performance of heterogeneous catalyst by combining first-principles calculation (1) and kinetic calculation techniques. Up to now, simulation studies mainly focused on a single or limited number of reaction pathways, and it was difficult to estimate the efficiency of a catalytic reaction without experimental information.
Atsushi Ishikawa, Senior Researcher, Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), performed computation of reaction kinetic information from first-principles calculations based on quantum mechanics, and developed methods and programs to carry out kinetic simulations ....

Atsushi Ishikawa , Precursory Research For Embryonic Science , Strategic Basic Research Program , National Institute For Materials Science , Green Research On Energy , Senior Researcher , Green Research , Environmental Materials , National Institute , Materials Science , Basic Research Program , Precursory Research , Embryonic Science , Chemistry Physics Materials Sciences , Atomic Molecular Particle Physics , Atomic Physics , Molecular Physics , அட்சூஷி இஷிகாவா , மூலோபாய அடிப்படை ஆராய்ச்சி ப்ரோக்ர்யாம் , தேசிய நிறுவனம் க்கு பொருட்கள் அறிவியல் , பச்சை ஆராய்ச்சி ஆன் ஆற்றல் , மூத்தவர் ஆராய்ச்சியாளர் , பச்சை ஆராய்ச்சி , சுற்றுச்சூழல் பொருட்கள் , தேசிய நிறுவனம் , பொருட்கள் அறிவியல் ,

Newly developed GaN based MEMS resonator operates stably even at high temperature


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IMAGE: The device processing for the double-clamped GaN bridge resonator on Si substrate:
(1) The as-grown GaN epitaxial film on Si substrate. Except for the AlN buffer layer, no strain removal layer is.
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Credit: Liwen Sang
Liwen Sang, independent scientist at International Center for Materials Nanoarchitectonics, National Institute for Materials Science (also JST PRESTO researcher) developed a MEMS resonator that stably operates even under high temperatures by regulating the strain caused by the heat from gallium nitride (GaN).
High-precision synchronization is required for the fifth generation mobile communication system (5G) with a high speed and large capacity. To that end, a high-performance frequency reference oscillator which can balance the temporal stability and temporal resolution is necessary as a timing device to generate signals on a fixed cycle. The conventional quartz resonator as the oscillator has the poor inte ....

Precursory Research For Embryonic Science , Strategic Basic Research Program , National Institute For Materials Science , International Center , International Electron Devices Meeting , Liwen Sang , Materials Nanoarchitectonics , National Institute , Materials Science , Basic Research Program , Precursory Research , Embryonic Science , Electron Devices Meeting , Temperature Compensated Gan , Strain Engineering , Chemistry Physics Materials Sciences , Superconductors Semiconductors , Electrical Engineering Electronics , Nanotechnology Micromachines , மூலோபாய அடிப்படை ஆராய்ச்சி ப்ரோக்ர்யாம் , தேசிய நிறுவனம் க்கு பொருட்கள் அறிவியல் , சர்வதேச மையம் , சர்வதேச எதிர் மின்னணு சாதனங்கள் சந்தித்தல் , தேசிய நிறுவனம் , பொருட்கள் அறிவியல் , அடிப்படை ஆராய்ச்சி ப்ரோக்ர்யாம் ,

A bit too much: reducing the bit width of Ising models for quantum annealing


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IMAGE: A method that can reduce the bit width of a quantum system called the Ising model to solve combinatorial optimization problems.
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Credit: Waseda University
Given a list of cities and the distances between each pair of cities, how do you determine the shortest route that visits each city exactly once and returns to the starting location? This famous problem is called the traveling salesman problem and is an example of a combinatorial optimization problem. Solving these problems using conventional computers can be very time-consuming, and special devices called quantum annealers have been created for this purpose. ....

Daisuke Oku , Nozomu Togawa , Shu Tanaka , Masashi Tawada , Precursory Research For Embryonic Science , Department Of Computer Science , Transactions On Computers , Green Computing Systems Research Organization , Communications Engineering , Waseda University , Professor Nozomu Togawa , Ising Model , Adding Auxiliary , Computer Science , Precursory Research , Embryonic Science , ஷு தனகா , துறை ஆஃப் கணினி அறிவியல் , பரிவர்த்தனைகள் ஆன் கணினிகள் , பச்சை கணினி அமைப்புகள் ஆராய்ச்சி ஆர்கநைஸேஶந் , தகவல்தொடர்புகள் பொறியியல் , நான் பாடுகிறேன் மாதிரி , கணினி அறிவியல் ,